1. Statistical Reference Guide
  2. Measurement systems analysis (MSA)

Repeatability & Reproducibility (CLSI EP05, EP15)Precision is the closeness of agreement between measured quantity values obtained by replicate measurements on the same or similar objects under specified conditions.

Precision is not a quantity and therefore it is not expressed numerically. Rather, it is expressed by measures such as the variance, standard deviation, or coefficient of variation under the specified conditions of measurement

  • Conditions of measurement
    Many different factors may contribute to the variability between replicate measurements, including the operator; the equipment used; the calibration of the equipment; the environment; the time elapsed between measurements.
  • Variance components
    Variance components are estimates of a part of the total variability accounted for by a specified source of variability.
  • Precision profile plot
    A precision profile plot shows precision against the measured quantity value over the measuring interval.
  • Variance function
    A variance function describes the relationship between the variance and the measured quantity value.
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From the Statistical Reference Guide for Analyse-it 6.24.0: https://analyse-it.com/docs/user-guide/measurement-systems-analysis/precision

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